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Title:Effect of prebending and hydroforming on thickness distribution for automobile decorative tailpipe
Authors: Li Ming Xu Yong Zhang ShiHong Xia Liangliang Ren ChunLei Lu Han Li Jingming Li Bo 
Unit: Institute of Metal Research Chinese Academy of Sciences University of Science and Technology of China Suzhou Shida Tongtai Automobile Components Co. Ltd. Henan Xingdi Forging Equipment Manufacturing Co. Ltd. 
KeyWords: tube bending  hydroforming  pulsating loading  thickness distribution  decorative tailpipe 
ClassificationCode:TG394
year,vol(issue):pagenumber:2020,45(3):41-46
Abstract:

For the overall manufacturing difficulty of the thin-walled decorative tailpipe in the exhaust pipe of a passenger car, the pre-bending and hydroforming processes of AISI 304 stainless steel tube were carried out to further improve the forming quality and efficiency of product. By software Dynaform, the influence of pre-bending process on the distribution of wall thickness for tube was studied, and the hydroforming under different loading modes was analyzed based on the above result. The results show that the thinning rate of the second bending region for tube has a tendency to decrease when the value of Δd for bent tube is small, and the trend is more obvious as the value of Δd decreases. Based on selected value of Δd, the finite element simulation for hydroforming is carried out. Compared with linear loading mode, pulsating loading reduces the maximum thinning rate from 17.6% to 12.1% in the vulnerable region, and the distribution of wall thickness is more uniform. The simulation and experimental results are basically consistent, and the maximum deviation is 2.17%. Thus, there is no defect for the final part whose appearance and size meet the requirements.

Funds:
国家自然科学基金资助项目(51875548)
AuthorIntro:
李明(1996-),男,硕士研究生 E-mail:mli18s@imr.ac.cn 通讯作者:徐勇(1983-),男,博士,副研究员 E-mail: yongxuyy@163.com
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